**The Joy of X” by Steven Strogatz**

STEVEN STROGATZ is the Schurman Professor of Applied Mathematics at Cornell University. A renowned teacher and one of the world’s most highly cited mathematicians, he has been a frequent guest on National Public Radio’s Radiolab. He is the author of Sync and The Calculus of Friendship, and the recipient of a lifetime achievement award for math communication. He also wrote a popular New York Times online column, “The Elements of Math,” which formed the basis for this book.